The Muppets were the brainchild of
Jim Henson. He was the one who took the major credit
in developing the characters on Sesame Street. Characters
like big bird and oscar the grouch. But after creating
Sesame Street he moved his endeavours to a show that
was more muppet centric.

That
show was the Muppet Show. It was a weekly show that
had special guest stars every week. Characters in
the show include Miss Piggy, Kermit The Frog, my
favorite - The sweedish Chef and odles more. There
are also many movies as well as Fraggle rock. The
fraggles are also part of Jim Henson productions.